I don't want to get into an argument for critiquing someone else's critique, but your site looks good to me.
Content... didn't read it so grammar/spelling may very well be bad, but I don't know.
HTML bugs or incorrect code? Didn't validate it or even look at the code. Could be ok, but maybe not. Validate it and make any necessary corrections because it's essential, that AT LEAST your homepage has good code.
Design - there are a lot of little things on your site that I personally wouldn't have done. The end result though, IMHO looks good. Simple, clean, etc. Obviously this is an opinion, which is why some others clearly disagree with me. Hope that helps.